| Discovery[1] | |
|---|---|
| Discovered by | N. Chernykh |
| Discovery site | Crimea–Nauchnij |
| Discovery date | 13 March 1977 |
| Designations | |
| (4009) Drobyshevskij | |
Named after | Edward Drobyshevski[1] (Russian astrophysicist) |
| 1977 EN1 · 1982 BP3 1984 SP5 | |
| main-belt[1][2] · (outer) Themis[3][4] | |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 53.96yr (19,708 d) |
| Aphelion | 3.5557AU |
| Perihelion | 2.7232 AU |
| 3.1394 AU | |
| Eccentricity | 0.1326 |
| 5.56 yr (2,032 d) | |
| 92.040° | |
| 0° 10m 37.92s / day | |
| Inclination | 2.2916° |
| 72.297° | |
| 181.12° | |
| Physical characteristics | |
| 14.19 km(calculated)[3] 16.31±1.16 km[5] 18.198±0.236 km[6][7] | |
| 3.87±0.02 h[8] 3.875±0.0060 h(S)[9] 3.882±0.0060 h(R)[9] | |
| 0.044±0.008[6][7] 0.071±0.011[5] 0.08(assumed)[3] | |
| C[10] · C(assumed)[3] | |
| 12.4[7] · 12.50[5] 12.54±0.15(R)[8] 12.577±0.003(R)[9] 12.6[2][3] · 12.84[10] | |
4009 Drobyshevskij, provisional designation1977 EN1, is a carbonaceous Themistianasteroid from the outer regions of theasteroid belt, approximately 16 kilometers (10 miles) in diameter. It was discovered on 13 March 1977, by Soviet–Russian astronomerNikolai Chernykh at theCrimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula, and named after Russian astrophysicistEdward Drobyshevski.[1] TheC-type asteroid has a relatively shortrotation period of 3.875 hours.[3]
Drobyshevskij is a core member of theThemis family (602),[3][4] a very largefamily of carbonaceous asteroids, named after24 Themis, the family'sparent body.[11] It orbits the Sun in theouter main-belt at a distance of 2.7–3.6 AU once every 5 years and 7 months (2,032 days;semi-major axis of 3.14 AU). Its orbit has aneccentricity of 0.13 and aninclination of 2° with respect to theecliptic.[2]
The body'sobservation arc begins with aprecovery taken at theGoethe Link Observatory in November 1963, more than 13 years prior to its official discovery observation at Crimea–Nauchnij.[1]
Drobyshevskij has been characterized as aC-type asteroid byPan-STARRS photometric survey. CALL also assumes it to be a carbonaceous C-type,[3] according to the Themistian asteroid's overallspectral type.[11]: 23
Three rotationallightcurves ofDrobyshevskij were obtained fromphotometric observations by astronomers at thePalomar Transient Factory in California. Lightcurve analysis gave arotation period between 3.87 and 3.882 hours with a brightness amplitude between 0.31 and 0.38magnitude (U=2/2/2).[8][9] TheCollaborative Asteroid Lightcurve Link (CALL) adopts a period of 3.875 hours from observations made in the S-band as the best result.[3] While not being afast rotator, the body's period is relatively short.
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Drobyshevskij measures between 16.31 and 18.198 kilometers in diameter and its surface has analbedo between 0.044 and 0.071.[5][6][7] CALL assumes an albedo of 0.08 and calculates a diameter of 14.19 kilometers based on anabsolute magnitude of 12.6.[3]
Thisminor planet was named afterEdward Drobyshevski (1936–2012), who was a Russian astrophysicist at theIoffe Institute of the Russian Academy of Sciences inSaint Petersburg, Russia. He is known for hiscosmogonical models and theories about the origin of thesmall Solar System bodies as well as for his research onstellar magnetic fields. The official naming citation was published by theMinor Planet Center on 18 February 1992 (M.P.C. 19694).[12]
